Sign sensitive aperture correction system and method
First Claim
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1. A method of edge enhancement, comprising the acts of:
- extracting a first high frequency portion in a first direction of data representative of relative light intensity of a reference pixel;
extracting a second high frequency portion in a second direction of data representative of relative light intensity of the reference pixel, the first direction being perpendicular to the second direction;
outputting selected data from the first high frequency portion and the second high frequency portion;
determining a correction coefficient based upon a sign and a value of the extracted high reference pixel in the data, the sign being indicative of a relation between the relative light intensity of the reference pixel and that of pixels surrounding the reference pixel; and
correcting the selected data based upon the correction coefficient.
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Abstract
The aperture correction system variably adjusts a correction efficient value based upon a sign and an original relative light intensity value or its equivalent. Because the correction is relative light intensity sensitive, the aperture correction is optimized, and the average light intensity is maintained before and after the aperture correction for natural appearance of the image.
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Citations
24 Claims
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1. A method of edge enhancement, comprising the acts of:
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extracting a first high frequency portion in a first direction of data representative of relative light intensity of a reference pixel; extracting a second high frequency portion in a second direction of data representative of relative light intensity of the reference pixel, the first direction being perpendicular to the second direction; outputting selected data from the first high frequency portion and the second high frequency portion; determining a correction coefficient based upon a sign and a value of the extracted high reference pixel in the data, the sign being indicative of a relation between the relative light intensity of the reference pixel and that of pixels surrounding the reference pixel; and correcting the selected data based upon the correction coefficient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for edge enhancement, comprising:
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an extraction unit for extracting a first high frequency portion in a first direction and a second high frequency portion in a second direction of data representative of relative light intensity of a reference pixel, the first direction being perpendicular to the second direction; a mixing unit connected to said extraction unit for outputting selected data from the first frequency portion and the second high frequency portion; a determination unit connected to said mixing unit for determining a correction coefficient based upon a sign and a value of the reference pixel in of the data, the sign being indicative of a relation between the relative light intensity of the reference pixel and that of pixels surrounding the reference pixel; and a correction unit connected to said determination unit and said extraction unit for correcting the selected data based upon the correction coefficient. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method of edge enhancement, comprising the acts of:
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extracting a high frequency portion of data representative of relative light intensity of a reference pixel; limiting the data based upon a predetermined range to generate limited data; determining a correction coefficient based upon a sign and a value of the reference pixel in the data, the sign being indicative of a relation between the relative light intensity of the reference pixel and that of pixels surrounding the reference pixel; and correcting the limited data based upon the correction coefficient. - View Dependent Claims (18, 19, 20)
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21. A system for edge enhancement, comprising:
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an extraction unit for extracting a high frequency portion of data representative of relative light intensity of a reference pixel; a limiting unit connected to said extraction unit for limiting data based upon a predetermined range and for generating limited data; a determination unit connected to said limiting unit for determining a correction coefficient based upon a sign and a value of the reference pixel in of the data, the sign being indicative of a relation between the relative light intensity of the reference pixel and that of pixels surrounding the reference pixel; and a correction unit connected to said determination unit and said limiting unit for correcting the limited data based upon the correction coefficient. - View Dependent Claims (22, 23, 24)
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Specification